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76                PRACTICAL ORGANIC  CHEMISTRY

add about I c.c. of a solution of common salt. Ethyl acetate,
recognised by its fragrant smell, separates out on the surface of
the liquid.

CH3.COC1 + C2H5OH = CH3.CO.OC2H5 -f HCL

3. Add two drops of acetyl chloride to a drop of aniline. A
vigorous action occurs, and a solid separates. This is acetanilide,
and may be obtained in larger crystals by dissolving in boiling
water and cooling slowly.

CH3.COC1 + C6H5NH2 - C6H6NH.CO.CH3 + HCL
See Appendix\ p. 241.

PREPARATION n.
Acetic Anhydride (Diacetyl Oxide), cHg'cO/0'
.,    Gerhardt, Ann. Chim. Phys., 1853, (3) 37, 311.
55 grms. sodium acetate (fused).
40         acetyl chloride.
A retort (250 c.c.) is attached to a short condenser and
receiver, which is furnished, as in the previous preparation, with
a calcium chloride tube. The tubulus of the retort is closed by
a cork, through which a tap-funnel is fixed. The fused sodium
acetate is prepared by fusing crystallised sodium acetate,
(CH3.COONa + 3H20). The sodium acetate (100 grams) is
,,                placed in a shallow tin and heated over a Bnnsen burner.
|                   It first melts in the water of crystallisation, after which it
 *                becomes solid, and finally melts again as the temperature rises.
When completely melted it is allowed to cool, powdered, and
introduced into the retort. The acetyl chloride is gradually
added through the tap-funnel, the retort being cooled in water.*
When the acetyl chloride has been added, the contents of the
,-                  retort are well stirred by means of a thick glass rocl pushed
through the tubulus. The retort is now closed by an ordinary
cork or stopper, and heated over a small flame, which should
be moved about to prevent the retort cracking. When nothing